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Chapter 3 DFT Computations of Transition-Metal Chemical Shifts
Probing the central metal with NMR can provide a wealth of information on the geometrical and electronic structure of transition-metal compounds. Accurate quantum-chemical computations of the salient metal NMR parameters can be a valuable complement to experiments, which are frequently plagued by low sensitivity, poor resolution or other fundamental problems, in particular for quadrupolar nuclei. Current computational approaches are mainly rooted in density functional theory and face different challenges, namely the proper choice of the exchange-correlation functional, and the treatment of relativistic, solvation and dynamical effects. This review summarizes the present state-of-the art of first-principles approaches for computation of transition-metal NMR parameters, calling special attention to the isotropic chemical shifts. Typical accuracies that can be reached for different classes of compounds are given, and illustrative chemical applications are highlighted. Corresponding results are also discussed for the full magnetic shielding and nuclear quadrupole coupling tensors, relevant for solid-state NMR spectroscopy, as well as for indirect spin-spin coupling constants involving transition-metal nuclei. In many cases, the computations can lead to a deeper understanding of the factors influencing the NMR parameters.
Chapter 3 DFT Computations of Transition-Metal Chemical Shifts
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Reference£º
Iron Catalysis in Organic Synthesis | Chemical Reviews,
Iron Catalysis in Organic Synthesis: A Critical Assessment of What It Takes To Make This Base Metal a Multitasking Champion